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#!/bin/sh
# See LICENSE file for copyright and license details.
set -e
usage () {
printf 'usage %s: [-Dry] in-file [out-file]\n' "$0" >&2
exit 1
}
recursive=no
delete_in_file=no
ffmpeg_flag_y=
status=0
while test "${1::1}" = '-'; do
if test "${1}" = '--'; then
shift
break
elif test "${1}" = '-'; then
break
fi
arg="${1:1}"
while test -n "${arg}"; do
flag="${arg::1}"
arg="${arg:1}"
if test "${flag}" = r; then
recursive=yes
elif test "${flag}" = D; then
delete_in_file=yes
elif test "${flag}" = y; then
ffmpeg_flag_y=-y
else
usage
fi
do
done
if test ! $# = 1 && test ! $# = 2; then
usage
fi
in_file="$1"
if test -z "${in_file}"; then
usage
fi
out_file=""
if test $# = 2; then
out_file="$2"
if test -z "${out_file}"; then
usage
fi
fi
getext () {
ffprobe -v error -select_streams a:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 -- "$1"
}
removeext () {
printf '%s\n' "$1" | sed 's/\.[^.]*$//'
}
extract () {
printf '\033[1m%s\033[m\n' "Extracting audio track from ${1}" >&2
printf '\033[1m%s\033[m\n' "and storing as ${2}" >&2
if ffmpeg -i "${1}" -vn -acodec copy ${ffmpeg_flag_y} -- "${2}"; then
if test ${delete_in_file} = yes; then
unlink -- "${1}"
fi
fi
}
if test ${recursive} = no || test ! -d "${in_file}"; then
if test -z "${out_file}"; then
out_file="$(removeext "${in_file}").$(getext "${in_file}")"
fi
extract "${in_file}" "${out_file}"
exit $?
fi
recursive () {
for in_file in "${1}/"*; do
out_file="$2/$(basename -- "${in_file}")"
if test -d "$f"; then
mkdir -p -- "${out_file}"
recursive "${in_file}" "${out_file}"
else
out_file="$(removeext "${out_file}").$(getext "${in_file}")"
if ! extract "${in_file}" "${out_file}"; then
status=1
fi
fi
done
if test ${delete_in_file} = yes; then
rmdir -- "${1}" 2>/dev/null || :
fi
}
if test -z "${out_file}"; then
out_file="${in_file}"
else
mkdir -p -- "${out_file}"
fi
recursive "${in_file}" "${out_file}"
exit $status
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